// This function is called to open a selector
    // dialog box
    function select(type, controlid)
    {
          window.open('/req/selector/' + type, controlid,
          'height=200,width=350,menubar=no,dependent=yes,resizable=yes,scrollbars=yes');
          return true;
    }

	// And this gets called when the end-user clicks on the _selected_ date,
	// or clicks on the "Close" button.  It just hides the calendar without
	// destroying it.
	function closeHandler(cal) {
	  cal.hide();                        // hide the calendar
	}

// This function gets called when the end-user clicks on some date.
	function selected(cal, date) {
	  cal.sel.value = date; // just update the date in the input field.
	  if (cal.dateClicked && (cal.sel.id == "start_date" || cal.sel.id == "end_date"))
	    // if we add this call we close the calendar on single-click.
	    // just to exemplify both cases, we are using this only for the 1st
	    // and the 3rd field, while 2nd and 4th will still require double-click.
	    cal.callCloseHandler();
	}


	// This function shows the calendar under the element having the given id.
	// It takes care of catching "mousedown" signals on document and hiding the
	// calendar if the click was outside.
	function showCalendar(id, format) {
	  var el = document.getElementById(id);
	  if (calendar != null) {
	    // we already have some calendar created
	    calendar.hide();                 // so we hide it first.
	  } else {
	    // first-time call, create the calendar.
	    var cal = new Calendar(false, null, selected, closeHandler);
	    // uncomment the following line to hide the week numbers
	    // cal.weekNumbers = false;
	    calendar = cal;                  // remember it in the global var
	    cal.setRange(1900, 2070);        // min/max year allowed.
	    cal.create();
	  }
	  calendar.setDateFormat(format);    // set the specified date format
	  calendar.parseDate(el.value);      // try to parse the text in field
	  calendar.sel = el;                 // inform it what input field we use

	  // the reference element that we pass to showAtElement is the button that
	  // triggers the calendar.  In this example we align the calendar bottom-right
	  // to the button.
	  calendar.showAtElement(el, "Br");        // show the calendar

	  return false;
	}

	var MINUTE = 60 * 1000;
	var HOUR = 60 * MINUTE;
	var DAY = 24 * HOUR;
	var WEEK = 7 * DAY;